chpass.c revision 1.25
1 /* $NetBSD: chpass.c,v 1.25 2002/08/08 04:49:26 enami Exp $ */ 2 3 /*- 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94"; 45 #else 46 __RCSID("$NetBSD: chpass.c,v 1.25 2002/08/08 04:49:26 enami Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 #include <sys/resource.h> 54 55 #include <ctype.h> 56 #include <err.h> 57 #include <errno.h> 58 #include <fcntl.h> 59 #include <pwd.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 #include <util.h> 65 66 #include "chpass.h" 67 #include "pathnames.h" 68 69 static char tempname[] = "/etc/pw.XXXXXX"; 70 uid_t uid; 71 int use_yp; 72 73 void (*Pw_error) __P((const char *, int, int)); 74 75 #ifdef YP 76 extern int _yp_check __P((char **)); /* buried deep inside libc */ 77 #endif 78 79 void baduser __P((void)); 80 void cleanup __P((void)); 81 int main __P((int, char **)); 82 void usage __P((void)); 83 84 int 85 main(argc, argv) 86 int argc; 87 char **argv; 88 { 89 enum { NEWSH, LOADENTRY, EDITENTRY } op; 90 struct passwd *pw, lpw, old_pw; 91 int ch, dfd, pfd, tfd, yflag; 92 char *arg, *username = NULL; 93 94 #ifdef __GNUC__ 95 pw = NULL; /* XXX gcc -Wuninitialized */ 96 arg = NULL; 97 #endif 98 #ifdef YP 99 use_yp = _yp_check(NULL); 100 #endif 101 102 op = EDITENTRY; 103 while ((ch = getopt(argc, argv, "a:s:ly")) != -1) 104 switch (ch) { 105 case 'a': 106 op = LOADENTRY; 107 arg = optarg; 108 break; 109 case 's': 110 op = NEWSH; 111 arg = optarg; 112 break; 113 case 'l': 114 use_yp = 0; 115 break; 116 case 'y': 117 #ifdef YP 118 if (!use_yp) 119 errx(1, "YP not in use."); 120 yflag = 1; 121 #else 122 errx(1, "YP support not compiled in."); 123 #endif 124 break; 125 default: 126 usage(); 127 } 128 argc -= optind; 129 argv += optind; 130 131 uid = getuid(); 132 switch (argc) { 133 case 0: 134 /* nothing */ 135 break; 136 137 case 1: 138 username = argv[0]; 139 break; 140 141 default: 142 usage(); 143 } 144 145 #ifdef YP 146 /* 147 * We need to determine if we _really_ want to use YP. 148 * If we defaulted to YP (i.e. were not given the -y flag), 149 * and the master is not running rpc.yppasswdd, we check 150 * to see if the user exists in the local passwd database. 151 * If so, we use it, otherwise we error out. 152 */ 153 if (use_yp && yflag == 0) { 154 if (check_yppasswdd()) { 155 /* 156 * We weren't able to contact rpc.yppasswdd. 157 * Check to see if we're in the local 158 * password database. If we are, use it. 159 */ 160 if (username != NULL) 161 pw = getpwnam(username); 162 else 163 pw = getpwuid(uid); 164 if (pw != NULL) 165 use_yp = 0; 166 else { 167 warnx("master YP server not running yppasswd" 168 " daemon."); 169 errx(1, "Can't change password."); 170 } 171 } 172 } 173 #endif 174 175 #ifdef YP 176 if (use_yp) 177 Pw_error = yppw_error; 178 else 179 #endif 180 Pw_error = pw_error; 181 182 #ifdef YP 183 if (op == LOADENTRY && use_yp) 184 errx(1, "cannot load entry using YP.\n" 185 "\tUse the -l flag to load local."); 186 #endif 187 188 if (op == EDITENTRY || op == NEWSH) { 189 if (username != NULL) { 190 pw = getpwnam(username); 191 if (pw == NULL) 192 errx(1, "unknown user: %s", username); 193 if (uid && uid != pw->pw_uid) 194 baduser(); 195 } else { 196 pw = getpwuid(uid); 197 if (pw == NULL) 198 errx(1, "unknown user: uid %u", uid); 199 } 200 201 /* Make a copy for later verification */ 202 old_pw = *pw; 203 old_pw.pw_gecos = strdup(old_pw.pw_gecos); 204 } 205 206 if (op == NEWSH) { 207 /* protect p_shell -- it thinks NULL is /bin/sh */ 208 if (!arg[0]) 209 usage(); 210 if (p_shell(arg, pw, NULL)) 211 (*Pw_error)(NULL, 0, 1); 212 } 213 214 if (op == LOADENTRY) { 215 if (uid) 216 baduser(); 217 pw = &lpw; 218 if (!pw_scan(arg, pw, NULL)) 219 exit(1); 220 } 221 222 /* Edit the user passwd information if requested. */ 223 if (op == EDITENTRY) { 224 dfd = mkstemp(tempname); 225 if (dfd < 0 || fcntl(dfd, F_SETFD, 1) < 0) 226 (*Pw_error)(tempname, 1, 1); 227 if (atexit(cleanup)) { 228 cleanup(); 229 errx(1, "couldn't register cleanup"); 230 } 231 display(tempname, dfd, pw); 232 edit(tempname, pw); 233 } 234 235 #ifdef YP 236 if (use_yp) { 237 if (pw_yp(pw, uid)) 238 yppw_error((char *)NULL, 0, 1); 239 else 240 exit(0); 241 /* Will not exit from this if. */ 242 } 243 #endif /* YP */ 244 245 246 /* 247 * Get the passwd lock file and open the passwd file for 248 * reading. 249 */ 250 pw_init(); 251 tfd = pw_lock(0); 252 if (tfd < 0) { 253 if (errno != EEXIST) 254 err(1, "%s", _PATH_MASTERPASSWD_LOCK); 255 warnx("The passwd file is busy, waiting..."); 256 tfd = pw_lock(10); 257 if (tfd < 0) { 258 if (errno != EEXIST) 259 err(1, "%s", _PATH_MASTERPASSWD_LOCK); 260 errx(1, "The passwd file is still busy, " 261 "try again later."); 262 } 263 } 264 if (fcntl(tfd, F_SETFD, 1) < 0) 265 pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1); 266 267 pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); 268 if (pfd < 0 || fcntl(pfd, F_SETFD, 1) < 0) 269 pw_error(_PATH_MASTERPASSWD, 1, 1); 270 271 /* Copy the passwd file to the lock file, updating pw. */ 272 pw_copy(pfd, tfd, pw, (op == LOADENTRY) ? NULL : &old_pw); 273 274 /* Now finish the passwd file update. */ 275 if (pw_mkdb(username, 0) < 0) 276 pw_error(NULL, 0, 1); 277 278 exit(0); 279 } 280 281 void 282 baduser() 283 { 284 285 errx(1, "%s", strerror(EACCES)); 286 } 287 288 void 289 usage() 290 { 291 292 (void)fprintf(stderr, 293 "usage: %s [-a list] [-s shell] [-l] [user]\n" 294 " %s [-a list] [-s shell] [-y] [user]\n", 295 getprogname(), getprogname()); 296 exit(1); 297 } 298 299 void 300 cleanup() 301 { 302 303 (void)unlink(tempname); 304 } 305
Indexes created Mon Sep 22 13:09:51 GMT 2025